CODEWITHSUNDEEP
c++classtemplatestemplate-templates
sandr1x
sandr1x

Reputation: 3

template template parameter: constructor initialization

I trying to initialize: 

template DoubleLinkedList<Student>::DoubleLinkedList(typename Student<int> _data);
 //error: Explicit instantiation of 'DoubleLinkedList' does not refer to a function template...

And constructor code is:

template <template <class> class T> DoubleLinkedList<T>::DoubleLinkedList(T<class _T> _data){
    head = NULL;
    curr = NULL;
    len  =    0;

    push(_data);
};

Template class that trying to convey:

template <template <class> class T> class DoubleLinkedList{};

Template in the which trying to convey:

template <class _T> class Student

UP

one more question: I have a structure in class in class. How can I turn to him?
curr = curr::_data->__name; // wrong

Upvotes: 0

Views: 418

Answers (1)

Kerrek SB
Kerrek SB

Reputation: 477570

You roughly want this:

template <template <class> class T>
class DoubleLinkedList
{
    DoubleLinkedList(T<int> _data);

    // ...
};

template <template <class> class T>
DoubleLinkedList<T>::DoubleLinkedList(T<int> _data)
{
    head = NULL;
    // ...
    push(_data);
}

Usage:

Student<int> s;
DoubleLinkedList<Student> x(s);

Upvotes: 2

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